2000 Miata: Check engine light is either on or flashing..enough fuel

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Check engine light is either on or flashing in my 2000 Miata. It does not get enough fuel to the engine when it's very cold. It has been in the shop numerous times. The catalytic converter was replaced & cleaner has been put in the injectors. This has been going on for a year (only during the winter months.) I am not getting good mileage when this roblem occurs.

spark plugs have been replaced. ignition coil has not. The code that showed up was PO500 which the service guy told me was a random misfire. When this problem randomly occurs the car shakes & acts like it wants to die as I am starting it. Then it barely putts along. I can push the accelerator to the floor & it will only go 30ph. After driving for a short distance it will suddenly clears out & runs like it's supposed to. It is kept in a garage & this does not happen first thing out of the garage but only after it has sat outside for a little bit.

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